From: Greg KH <gregkh@linuxfoundation.org>
To: hinxx <hinxx@protonmail.com>
Cc: "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: sendfile(2) use with a char driver
Date: Wed, 30 Nov 2022 08:05:03 +0100 [thread overview]
Message-ID: <Y4cAn1foct0ItDzK@kroah.com> (raw)
In-Reply-To: <bb1-8NcxtVn8HSt49oYW5HaHrKdOa814M4_SnZAqAKxacGs9rbrHsadsdzZIDBaZ-w4Ki2H2InCY83bq0uBzOkj23YtHz3hYfqOFPKL87F0=@protonmail.com>
On Tue, Nov 29, 2022 at 09:15:24PM +0000, hinxx wrote:
> I'm looking to use a sendfile(2) with a Xilinx XDMA kernel driver in order to move data from a PCIe board with Xilinx FPGA to the network card with "zero-copy".
>
> Currently I'm getting EINVAL return status from sendfile(2) when providing opened XDMA device file descriptor as input fd.
>
> The device driver provides a character device that can be mmap'ed.
>
> There seem to be other restrictions. Can anyone provide insight on what would be needed to make this work?
Please contact the authors of your kernel driver, they can answer this
best.
good luck!
greg k-h
next prev parent reply other threads:[~2022-11-30 7:05 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-29 21:15 sendfile(2) use with a char driver hinxx
2022-11-30 7:05 ` Greg KH [this message]
2022-11-30 8:23 ` hinxx
2022-11-30 10:48 ` Greg KH
2022-12-01 9:08 ` hinxx
2022-12-01 12:23 ` Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Y4cAn1foct0ItDzK@kroah.com \
--to=gregkh@linuxfoundation.org \
--cc=hinxx@protonmail.com \
--cc=stable@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.